Pump and strainer



June 20, 1933.

Filed Sept. 15, 1929 G. H. MESSER PUMP AND STRAINEH 2 Sheets-She'et 1 I I ATTORNEYS.

June 1933- G. H. MESSER ,91 ,;6

PUMP AND STRAINER Filed Sept. 13, 1929 2 Sheets-Sheet 2 INVENTOR Patented June 20, 1933 PATENT? OFFICE GMRGE H. KESSER, OF NEWARK, NEW JERSEY' PUMP AND STBAINEB Application filed September 18, 1929. Serial No. 392,287.

This invent-ion relates in general to pumps and strainers, one object of the invention being to provide a novel and improved combination of a pump and a strainer which shall be simple, inexpensive and compact in construction and eficient and substantially noiseless in operation.

Another object is to provide a novel and improved strainer which is constantly rotated during operation so as to centrifugally throw ofi or deflect solid particles and prevent them from passing through the strainer. Other objects are to provide a combined pump and strainer wherein the strainer is arran d in the outlet chamber of the pump and 'llquid is forced through the strainer into the outlet passa e which is formed by a rotatable tubular driving shaft upon which the strainer is mounted so as to rotate therewith; to provide a rotary gear pump wherein the intermeshing gear plstons are driveii by a pinion ona tubular shaft which also serves as an outlet for the pump; and to obtain other advantages and results as will be brought out by the following description.

Referring to the accompanying drawings in which corresponding and like parts are I designated throughout the several views by the same reference characters:

Figure 1 is an end elevation of a pump embodying my invention. a

Figure 2 is a side elevation thereof.

Figure 3 is an enlarged side elevation of the pump with one section of the casing re- 5 moved, portions being, broken away and shown in section.

Figure 4 is a transverse vertical sectional view on the line 4-4 of Figure 3.

Figure 5 is a similar view on the line 55 of Figure 3.

Figure 6 is a transverse vertical sectional view on the line 6-6 of Figure 5.

Figure 7 is a detached side elevation of the strainer and Figure 8 is an enlarged transverse vertical sectionalview through one of the gear pistons and its mounting. a

S ifically describing the illustrated embodiment of the invention, the pump comprises a casing formed of the sections A and B which are separably connected by cap screws or the like 1. One of the casing sectrons, in the present instance the section A, has a pump chamber 2 formed therein in which are journaled a pair of intermeshing gear pistons -3 and 4. The pump chamber has an inlet passage 5 at one side of the pistons 3 and 4 to which is connected an inlet pipe 6. At the other side of the pump pistons is an outlet chamber 7 from which leads a passage 9 to which may be connected a pressure gauge 10. Another passage 11 also communicates with the outlet chamber and has connected thereto a pressure relief valve 12 to which is in turn connected an overflow or return pipe 13.

For driving the gear pistons 3 and 4 I may utilize a pinion 14 which is arranged in the outlet chamber 7 and rigidly secured as by a key 15 to one end of a tubular shaft 16 which 79 extends through an opening 17 in the casin section A into the outlet chamber. This sha t 16 may comprise the shaft of an electric motor or other suitable source of power 18. Interpo'sed between the pinion 14 and the 7 adjacent inner surface of the casing section A is ahardened steel washer 19, and surrounding the shaft 16 is a packing gland 20 to prevent leaka e of the liquid out of the opening 17. Pre erably a passage 21 is provlded in the casing section A to establish communigation between the inlet 5 and the opening 1- The casing section B has a plurality of openings 22 for establishing communication between the outlet chamber 7 and the outlet or strainer casing 23. This outlet casing may comprise a cup-like chamber 24 secured byscrews 25 to the outside of the casing section substantially coaxially withv the end of the shaft 16 which also projects through the casing section B into the outlet casing. A strainer 26 is secured upon the end of the tubular shaft 16 to rotate therewith, and this strainer may comprise a hollow body 27 circular in cross-section having screw threads for securing it upon the shaft. The body is provided with a plurality of circumferential grooves 28 at the bases of which are openings 29 leading into the interior of the I strainer casing I and ma body which communicates withthe passage through the tubular shaft 16. .Secured to the body exteriorly thereof isa wire mesh coverm Y ith this construction it will be observed that upon rotation of the shaft 16 by the motor 18, the gear pistons 3 and 4 will be driven in the direction of the arrows on Figure 3 by the pinion 14. This will draw liquid into the inlet 5 and force it into the outlet chamber 7 under pressure. The liquid will then pass throu h the openin 22 into the 3 and throug the strainer into the passage in the tubular shaft 16 which forms the outlet passage for the pump convey the liquid to any suitable point. he strainer 26 is constantly rotated at high speed and tends to throw off or deflect'any solid particles in the liquid which may attempt to pass through the mesh covering 30. At the same time this centrifugal action incident to rotation of the strainer prevents collection of any solid matter on the strainer and thereby obviates any stoppage of the flow of the liquid.

The pressure in the outlet chamber forces the pinion 14 tight against the hardened washer 19 which is in turn forced into tight contact with the wall of the casing section A so asto retard any leakage around the shaft 16.- At the same time, a suction is created in the opening 17 by the passage 21 which further retards any leakage through the opening 17'. The gland 20 providesv an additional packing to prevent leakage around the shaft 16.

Another important feature of my invention isthe mounting of the gear pistons 3 and 4 in the casing. Asv shown in Figures 3, 4, and 8, a stub shaft 31 for 'eachgear piston is journaled in corresponding recesses inner walls of the casing. This avoids chat- 32 and 33 in the respective casing sections A and B. Each stub shaft has a central collar 34, the median portion 35 of the periphery of which is substantially cylindrical and c0- axial with the' stub shaft. The other portions 36 at opposite sides of the portion of the periphery of the collar recede away therefrom toward the axis of the shaft. Each gear piston has a centralopening 370i a diameter slightly .greater than that of the median portion 35 of the corresponding stub shaft and of a length substantially greater than the width of said median portion as clearly shown in. Figure 8 of the drawmgl' This construction provides for a limited ti t ing movement of the gear piston into planes oblique to the axis of the corresponding stub shaft so that the teeth of the gear-pistons can ad ust. themselves to each other and the sides of the pistons may adjust themselves to the tering incident to'the improper meshing of the gear teeth, or jamming of the gears upon the casing, or binding'ofthe stub Shaft 31 in the casing. It has been found that with such a construction the pump is substantially noiseless in operation and extremely eflicient.

causes rotation of the stub shaft and provides against jamming of the peripheries of the gears against the walls of the pump chamber 2.

While I have shown and described the invention as embodied in certain details of construction it should be understood that this is primaril for the purpose of illustrating the princip es of the invention and that many modifications and changes may be made in the details of construction without departing from the, spirit or scope of the invention.

Having thus described my invention, what I claim is:

A rotary pump comprising a main casing formed of two complemental sections secured together, one of which is recessed to form a pump chamber, an inlet chamber and an outlet chamber between them, the .outlet chamber having outlet openings through one of said sections, an outlet casing removably secured tothe exterior of the second-mentioned section over said outlet openings, a plurality of intermeshing gear pistons journaled in said pump chamber to forceliquid from said inlet chamber into said outlet casing, a tubular drive shaft having one end arranged in said outlet casing and the other end projecting from the main casing pinion on said drive, shaft meshing with one of said gear pistons, and a strainer removably secured upon-and covering the end of the drive shaft within said outlet casing to rotate with said drive shaft.

- GEORGE H. MESSER. 

